fix(docs): remove python 2 documentation from docs

Author: KaiSchwarz-cnic

docs/installation.rst

@@ -9,6 +9,9 @@ Python Version
 We recommend using the latest version of Python 3. hexonet.apiconnector
 supports Python 3.x and 2.7.
 
+NOTE: Since v3.x (2019-04-01, yes no joke!), we removed python 2.7
+ compatibility.
+
 
 Dependencies
 ------------
@@ -28,11 +31,7 @@ hexonet.apiconnector:
 
 .. code-block:: sh
 
-    pip install hexonet.apiconnector
-    # for python 2.x
-
     pip3 install hexonet.apiconnector
-    # for python 3.x
 
 The connector library is now installed. Check out the
 :doc:`/quickstart` or go to the

docs/upgrading.rst

@@ -14,11 +14,7 @@ hexonet.apiconnector. Such breaking changes are covered through major releases.
 Use the :command:`pip` command to upgrade your existing hexonet.apiconnector
 installation by providing the ``--upgrade`` parameter::
 
-    $ pip install --upgrade hexonet.apiconnector --user
-    # for python 2.x
-
-    $ pip3 install --upgrade hexonet.apiconnector --user
-    # for python 3.x
+    $ pip3 install --upgrade hexonet.apiconnector
 
 See the how to migrate your code by reading the `release notes`_.
 We publish there any information on how to migrate.